NOTE: As their name suggests hints are not exactly Greg Hastings Paintball 2 cheats, and are usually just simple (but very useful) tips on how you can unlock secret level, features, find hidden areas and such. Hopefully these will make playing Greg Hastings Paintball 2 even more entertaining.

Achievements
Billboard (10): Win an event while using the jersey, pants and marker from the same manufacturer.
Bottom Feeder (20): Win a round entirely from the prone position.
Bromance (10): Win a split-screen round where neither you nor your buddy are eliminated.
Connoisseur (100): Purchase all gear.
Cross Training (10): Win a woodsball and a speedball tournament.
Demolitionist (20): Eliminate three or more opponents with a single grenade.
E'Ventual Evaporation (30): Eliminate three opponents in a single round with a completely fogged mask.
Foam Cowboy (5): Win a round while wearing the "Rodeo King" mask.
Go Ballistic (25): Eliminate an opponent that you can't see using the paintballs' trajectory.
Goggler (20): Eliminate three opponents by shooting them in the goggles in a single round.
Jack of All Trades (50): Complete all Recball Events.
Lawlessness (50): Successfully cheat five times in a row without failing.
Lonewolf (20): Win a 7-on-7 or higher non-reinsertion game where you eliminate all opponents.
Lucky Clip (50): Eliminate an entire enemy team using a single pistol clip in a non-reinsertion game.
Master Woodsman (50): Complete all Woodsball Events.
Mr. Popular (75): Play games with teammates from 50 real teams.
Olympian (15): Dive or slide 100 times.One Hit Wonder (15): Win a round with 3+ eliminations using a marker without having to reload in a 5v5 or larger match.
Paint Monger (10): Shoot 10,000 paintballs.
Paintball Legend (100): Complete all 3 event tracks
Pump Assassin (50): Using a pump-gun, eliminate 3 or more opponents in a round without missing.
Sharpshooter (20): Get three or more eliminations in a round with over 25% accuracy.
Speedball Champion (50): Complete all Speedball events.
Spy (15): Shoot an opponent in the back from their own side of the field.
Tactical Overkill (20): Eliminate an opposing flag carrier with a rocket.
Team Captain (5): Win a round where you issue field commands to at least 3 teammates.
Unbreakable (25): Win a round without losing a teammate in a 5-on-5 or bigger match-up.
Wiper (5): Succesfully cheat once.
World's Greatest Paintballer (125): Complete all events on Hard.